[cfe-dev] source-code representation of an Expr

[Ted Kremenek]

We should probably add this to a FAQ of some sort that documents how to do X with Clang.

On Dec 30, 2010, at 12:02 PM, Sam <sam at cs.jhu.edu> wrote:

> John, 
> 
> That works perfectly.  Thank you so much for your help!
> 
> Sam
> 
> On Wed, Dec 29, 2010 at 4:20 PM, John McCall <rjmccall at apple.com> wrote:
> On Dec 29, 2010, at 12:53 PM, Sam wrote:
> > Yes, I just don't know what to *do* with it ;-) In other words, I don't see a clear use of the SourceManager API once I have the SourceRange to extract the Expr's source-code.  I don't see any API calls that use SourceRange or beginning and ending SourceLocations for source-code extraction.
> 
> We should probably make some API for this.
> 
> What you can do for now is something like the following:
> 
>  SourceRange range = expr->getSourceRange();
>  if (range.getBegin().isMacroID() || range.getEnd().isMacroID()) {
>    // handle this case
>  } else if (!sourceManager.isFromSameFile(range.getBegin(), range.getEnd())) {
>    // handle this case
>  } else {
>    range.setEnd(preprocessor.getLocForEndOfToken(range.getEnd()));
>    const char *begin = sourceManager.getCharacterData(range.getBegin());
>    const char *end = sourceManager.getCharacterData(range.getEnd());
>    llvm::StringRef string(begin, end - begin);
>    // now you can do whatever you want
>  }
> 
> John.
> 
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